Text Proposals of PHY Frame and Physical Structure for 16n Direct Communication

IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number:

IEEE S802.16n-11/0071Date Submitted:

2011-05-16Source:

Sungcheol Chang, Eunkyung Kim, Sungkyung Kim, Hyun Lee, Chulsik Yoon E-mail: scchang@etri.re.kr , ETRI ekkim@etri.re.kr

Venue:Call for Comments on the 802.16n Amendment Working Document < 80216n-10_0049r1.pdf >

Base Contribution:IEEE C802.16n-11/0071

Purpose:To be discussed and adopted by TG802.16n

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Key Requirement of Direct Communication for PPDR Application

• Talk-around Direct Communications among HR-MSs– HR-MS shall communicate with adjacent HR-MSs

independent of infrastructure communication.• Firefighters’ scenario in basement under ground

• Disaster relief scenarios on the scene of disaster

• Service Coverage as large as possible– The coverage is critical to PPDR scenarios.

• TETRA’s DC coverage is known as 400m ~ 2Km for 25 kHz carrier bandwidth

– It may be a problem of firefighter’s life under ground.

Talk-around Direct Communication (1)

• Direct communication among adjacent HR-MSs– Independent of radio deployments:

• Under BS coverage

• Out of BS coverage

• Critical scenarios not supporting talk-around communication with a BS-controlled DC approach– HR-MSs out of BS coverage

HR-BSHR-BS

DC Use Case 1

DC Use Case 2

Talk-around Direct Communication (2)

• Critical scenarios not supporting talk-around communication with a BS-controlled DC approach– HR-MSs under a BS coverage and HR-MSs under BS

coverage• No communication between HR-BSs

HR-BSHR-BSDC Use Case 1

DC Use Case 2

HR-BSHR-BS

DC Use Case 2

DC Use Case 1

No Communication between HR-BSs

Talk-around Direct Communication (3)

• Critical scenarios not supporting talk-around communication with a BS-controlled DC approach– Multi-mode operation of HR-MS acting as HR-BS

• No backhaul connection

• Small coverage of HR-MS acting as HR-BS because of HR-MS’s power emission limitation.

HR-BSHR-BS

DC Use Case 1

DC Use Case 2 DC Use Case 2

DC Use Case 1

HR-MS acting as HR-BS

HR-MS acting as HR-BS

DC Use Case 2

DC Use Case 1

HR-MS acting as HR-BS

HR-MS acting as HR-BS

Talk-around Direct Communication (4)

• How to cover all the critical scenarios of talk-around DC that are described previous slides?– Solution: a distributed resource allocation among adjacent HR-

MSs.• Independent operation of BS deployments

• An HR-MS sends packets on a selected resource

• HR-MSs receive packets on the resource if the sending HR-MS shares resource information with the receiving HR-MSs.

– No changes of DC algorithms across DC use cases.• It’s hard to detect boundaries across DC use cases

• DC disables at a period if DC algorithms change.

Talk-around Direct Communication (5)

• How to share resource information among HR-MSs?– Solution: a dedicated resource that HR-MSs share for talk-

around direct communication.• Synchronization among adjacent HR-MSs

• Random access based communication with adjacent HR-MSs

– A proposal for 16m based specification

Frame 1 Frame 2 Frame 3 Frame 4

DL DL DL DL DL UL UL ULDedicate Resource for Direct Communication

Super frame Super frame Super frame

Talk-around Direct Communication (6)

• A BS-controlled resource allocation approach could not meet the talk-around direct communication requirement for PPDR application

• The BS-controlled resource allocation approach is applicable to both DC use case 1 and DC use case 2 only.– This is for applications including Smart Grid NOT PPDRNOT PPDR.

Talk-around Direct Communication (7)

• Proposes to provide two types of direct communications in IEEE 802.16n– A BS-controlled resource allocation for direct communication

to meet requirements from applications including Smart Grid.• Consistent with existing infrastructure frame structure

• Most of signaling procedures are between HR-MS and HR-BS– A few of Signaling procedures between HR-MSs (?) <= I am not sure.

– A distributed resource allocation for talk-around direct communication to meet requirements from PPDR applications• Talk-around DC resources and infrastructure resources are exclusive

• Most of signaling procedure are among adjacent HR-MSs

Service Coverage (1)

• The TETRA system uses 25 kHz carrier bandwidth.– The minimum bandwidth of 16m carrier is 5MHz.

• The ratio of 16m carrier bandwidth to TETRA’s one is 200 (23dB).– Service coverage loss by 23dB

– For example) If we assume 5 dB loss across a floor (wall), 16m’s service coverage is short about 4 floors under ground.

Service Coverage (2)

• How to extend service coverage of talk-around direct communication?– Solution: A narrowband signal transmission for talk-around

direct communication.• One PRU for synchronization and contention based transmission• The minimum unit for talk-around communication among HR-MSs

is 1/6 PRU.

PRU

24 PRUs in frequency domain for 5MHz bandwidth

Subframe

PRU PRU PRU PRU PRU PRU PRU PRU PRU PRU PRU PRU PRU PRU PRU PRU PRU PRU PRU PRU PRU PRU

Talk-around Direct

Communication

Dedicated resource for narrowband talk-around direct communication

The minimum resource unit (1/6 PRU) of voice traffic transmission for narrowband

talk-around direct communication

Proposed text for 16n AWD

• See IEEE C802.16n-11/0071.doc to support talk-around direct communication from PPDR application– A physical frame structure

• An exclusive dedicated resource in UL subframe• A basic frame structure example

– A DM superframe

– A DM radio frame

• Static transmission and receipt configuration per HR-MS– Logical LANE concept for persistent operation (voice traffic)

Conclusion

• Proposes to provide two types of direct communications in 16n specification– A BS-controlled resource allocation of direct communication

for applications including Smart Grid. (out of scope of this contribution)

– A Distributed resource allocation of talk-around direct communication for PPDR applications.

• Key requirements from PPDR application– Talk-around direct communication

• Proposal of distributed resource allocation

– Service coverage• Proposal of narrowband transmission (1/6 PRU=34kHz bandwidth)